Carbon Dioxide is a common gas resource. It is exhaled by Duplicants and occurs naturally in almost all Biomes. It is heavier than most other gases and will sink to the lowest elevation if lighter gases are present.

Carbon Dioxide is considered sterile and in large concentrations will prevent food rot (completely, unlike Refrigerator). Due to ease of handling (tendency to pool in pits) and acquisition (funnel-shaped bases will have a large pool of it at the bottom), it is perfect for food storage.

If cooled below condensation temperature, it can safely be stored away as a liquid or solid.

Despite creating a sterile environment, Carbon Dioxide does not prevent Compost from working and is perfectly safe for plants. The tendency to pool at the bottom can help to ensure adequate air pressure.

In early game, to prevent CO2 buildups, many players build 'Carbon pits', where they pool carbon dioxide until they are able to get rid of it with Carbon Skimmers, compress it, vent it into space or otherwise deal with it..

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